Finding out area of triangles given the sides

area of triangle given the length of sides is given by

\[\sqrt{s(s-a)(s-b)(s-c}) \]

where s is semiperimeter of triangle and a ,b ,c are the length of sides  of triangles ABC

\[2s=a+b+c \]

For a= 3   b=4 and   c=5

\[s-a=3 \]

\[ s-b = 2 \]

\[ s-c =1 \] 

hence area=6

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